月亮代表我的心。

Yuèliang dàibiǎo wǒ de xīn.

The moon represents my heart.

老师选了他代表我们班参加比赛。

Lǎoshī xuǎn le tā dàibiǎo wǒmen bān cānjiā bǐsài.

The teacher chose him to represent us at the competition.

他是代表中国队的选手。

Tā shì dàibiǎo Zhōngguóduì de xuǎnshǒu.

He is a player representing the Chinese team.